Pin Windows 1909 image to 862383fcc885 (#422)
Pin Windows 1909 image to 862383fcc885 (#422)

Newer images are missing libraries that prevent the Python installer
from running. This will stop things from breaking until we have a fix.

Signed-off-by: Scott K Logan <8c724d14625be4be480086a9212b212477a303ef@cottsay.net>
ros2/ci,ros2/ci,ros2/ci